WO2001017064A1 - Antenne plane compacte en f inverse - Google Patents

Antenne plane compacte en f inverse Download PDF

Info

Publication number
WO2001017064A1
WO2001017064A1 PCT/US2000/040740 US0040740W WO0117064A1 WO 2001017064 A1 WO2001017064 A1 WO 2001017064A1 US 0040740 W US0040740 W US 0040740W WO 0117064 A1 WO0117064 A1 WO 0117064A1
Authority
WO
WIPO (PCT)
Prior art keywords
edge
ground plane
planar
tab
planar portion
Prior art date
Application number
PCT/US2000/040740
Other languages
English (en)
Inventor
Mohamed Sanad
Original Assignee
Antennas America, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Antennas America, Inc. filed Critical Antennas America, Inc.
Priority to AU80344/00A priority Critical patent/AU8034400A/en
Publication of WO2001017064A1 publication Critical patent/WO2001017064A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/005—Patch antenna using one or more coplanar parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to antennas and more particularly to a compact isotropic planar inverted F antenna.
  • Planar inverted F antennas generally include at least one planar radiating element and a ground plane in a plane parallel to the radiating element.
  • a short tab at one end of the radiating element that extends transverse to the radiating element is connected to the ground plane.
  • a coaxial cable extends through the ground plane at a selected location and the center pin of the coaxial cable is connected to the radiating element.
  • This type of antenna is called an inverted F antenna because the side profile is shaped like the letter F with the radiating element forming the long portion, the tab forming top transverse leg and the center pin of the coaxial cable forming the other transverse leg.
  • the radiating element is located relatively near the ground plane so that the length of the tab is less than 10% of the length of the radiating element.
  • Planar inverted F antennas are used in wireless communications. As the number of wireless applications increases and the physical size of wireless devices decreases, antennas for these applications and devices are needed. Prior known planar inverted F antennas have been limited by the required size of the radiating element, the required size of the ground plane, limited bandwidth and limited isotropic characteristics.
  • a compact planar inverted F antenna having a circuit element and a ground plane is disclosed.
  • the circuit element is conductive sheet, preferably brass, and includes a planar portion with a tab.
  • the tab is narrower than the planar portion and extends perpendicular to the plane of the planar portion from a first edge.
  • the length of the tab is about 25% and greater of the length of the planar portion.
  • the planar portion has a reactance window extending inward from an edge that is adjacent to the first edge.
  • the ground plane includes a substrate, a conductive planar first portion on a first side of the substrate, and conductive planar second and third portions on a second side of the substrate.
  • the second and third portions are connected to the first portion through vias near a first end of the substrate and near a second end opposite the first end, respectively.
  • the second and third portions are separated by a gap extending across the substrate parallel to the first end.
  • the tab of the circuit element is soldered to the first portion of the ground plane.
  • a feed probe is soldered to the circuit element and to a plated pad on the first portion of the ground plane.
  • Figure 1 is a perspective view of an antenna embodying features of the present invention.
  • Figure 2 is a top plan view of the antenna of Figure 1.
  • Figure 3 is a side elevation view of the antenna of Figure 1.
  • Figure 4 is an end elevation view of the antenna of Figure 1.
  • Figure 5 is a top plan view of the ground plane of the antenna of Figure 1.
  • Figure 6 is a bottom plan view of the ground plane of the antenna of Figure 1.
  • the compact planar inverted F antenna embodying features of the present invention includes a circuit element 10 and a ground plane 11.
  • the circuit element has a planar portion 13 which is the main radiating element and a tab 14.
  • the planar portion 13 is generally rectangular with a first edge 15, a spaced second edge 16 opposite the first edge 15, and spaced, opposed third and fourth edges 17 and 18 extending between and transverse to the first and second edges 15 and 16.
  • the planar portion 13 also has a reactance window 20.
  • the reactance window 20 is generally rectangular and extends inward from third edge 17 towards fourth edge 18 parallel to and spaced a selected distance from the first edge 15.
  • the tab 14 is rectangular with a first edge 22 that is connected to the first edge 15 of the planar portion 13 and a spaced second edge 23 opposite the first edge 22.
  • the tab 14 has a length from the first edge 22 to the second edge 23 that is equal or greater than 25% of the length of the planar portion 13 from the first edge 15 to the second edge 16.
  • the tab 14 extends in a plane transverse or perpendicular to the plane of the planar portion 13 and the tab 14 is narrower than the first edge 15 of the planar portion 13.
  • the tab 14 is shown midway between the third edge 17 and the fourth edge 18, however the tab 14 may be located at any position along the first edge 15.
  • An aperture 25 is located in the planar portion 13 intermediate the first edge 15 and the reactance window 20 and intermediate the third and fourth edges 17 and 18.
  • the ground plane 11 includes a substrate 27 that is generally rectangular with a planar first side 28 and a spaced second side 29 opposite the first side 28, and a first end 30 and a spaced second end 31 opposite the first end 30.
  • a conductive first portion 33 is attached to and substantially covers the first side 28 of the substrate 27, and has a first end 34 adjacent to the first end 30 of the substrate 27 and a second end 35 adjacent to the second end 31 of the substrate 27.
  • Conductive second and third portions 37 and 41 are attached to the second side 29 of the substrate 27.
  • the conductive second portion 37 has a first end 38 adjacent to the first end 30 of the substrate 27 and extends inward on second side 29 of substrate 27 to a spaced second end 39 opposite the first end 38.
  • the third conductive portion 41 has a first end 42 adjacent to the second end 31 of the substrate 27 and extends inward on second side 29 of substrate 27 to a spaced second end 43 opposite the first end 42.
  • the second end 39 of the second portion 37 and the second end 43 of the third portion are separated on the second side 29 of the substrate 27 by a uniform gap 45.
  • the first portion 33 is conductively connected to the second portion 37 with plated through holes or vias 46 that extend through substrate 27 near the first end 30 of substrate 27.
  • the first portion 33 is conductively connected to the third portion 41 with plated through holes or vias 46 that extend through substrate 27 near the second end 31 of substrate 27.
  • the ground plane 11 is preferably made with a copper clad or copper covered suitable substrate such as FR4 with the gap 45 etched or otherwise removed from the second side 29 of the substrate.
  • the conductive first, second and third portions 33, 37 and 41 are essentially folded or wrapped around the substrate 27 and effectively provide a ground plane almost twice the size of the first portion 33 but occupying only the space of the first portion 33.
  • the second edge 23 of the tab 14 of the circuit element 10 is attached to the first portion 33 of the ground plane 11, spaced from and substantially parallel with the first end 34 of the first portion, such that the planar portion 13 of the circuit element 10 is spaced from and in substantially parallel alignment over the ground plane 11.
  • the first portion 33 of the ground plane 11 includes an opening 47 generally aligned with the aperture 25 in the planar portion 13 of the circuit element 10.
  • a plated pad 48 is located inside the opening 47 with clearance around the pad 48 so that the pad 48 is electrically isolated from the first portion 33.
  • a feed probe 49 is attached, preferably by soldering, between the pad 48 and the aperture 25.
  • a coaxial cable 51 is attached with the center pin 52 of the coaxial cable 51 being connected to feed probe 49 near pad 48 and the shield cover 53 of the coaxial cable 51 being connected to the first portion 33 of the ground plane 11 adjacent to the opening 47.
  • the center pin 52 of the coaxial cable 51 can be attached directly to the aperture 25
  • the shield cover 53 of the coaxial cable 51 can be attached to the first portion 33 of the ground plane 11 and the opening 47, the pad 48 and the feed probe 49 can be eliminated.
  • the circuit element 10 is partially shorted to the ground plane 11 by the tab 14 that is narrower than the first edge 15 of the planar portion 13, which reduces the required size of the antenna.
  • the reactance window 20 reduces the required size of the antenna.
  • the reactance window 20 also increases the amount of diffracted wave, thereby improving the isotropic characteristics and making the antenna sensitive to two perpendicular polarizations.
  • Multiple tabs or reactance windows could be provided.
  • the length of the tab 14 and feed probe 49, and therefore the depth of the antenna, are greater than in prior known planar inverted F antennas.
  • Prior known planar inverted F antennas have a tab length and feed probe length of less than 10% the radiating element length whereas the antenna of the present invention has a tab length and feed probe length of more than 25% the radiating element length.
  • This longer feed probe 49 is a significant radiating element, further improving the isotropic characteristics.
  • the first, second and third portions 33, 37 and 41 of the ground plane 11, connected as described, provide a compact ground plane that is electrically large enough to avoid lowering efficiency.
  • an antenna embodying features of the present invention designed for use with Global System for Mobile Communications (GSM) systems for frequencies in the range of about 890 to 960 MHz would be dimensioned as follows.
  • the circuit element 10 is made from brass sheet with an exemplary thickness of 0.375 mm (0.015").
  • the planar portion 13 has a length of 54 mm from the first edge 15 to the second edge 16 and a width of 36 mm from the third edge 17 to the fourth edge 18.
  • the reactance window 20 extends 20 mm inward from the third edge 17 of the planar portion 13, is 2 mm wide and spaced 16 mm from the first edge 15.
  • the tab 14 has a length of 14 mm from the first edge 22 to the second edge 23 and a width of 16 mm.
  • the aperture 25 is centered between the third and fourth edges 17 and 18 of the planar portion 13, is spaced 8 mm from the first edge 15 and is about 1.25 mm (0.050") in diameter.
  • the ground plane 11 is made from 1.0 mm (.040") thick FR4 with 2 oz. copper on each side.
  • the ground plane 11 has a length of 68 mm from the first end 30 to the second end 31 of the substrate 27 and a width of 40 mm and the first portion 33 has these same dimensions.
  • the second portion 37 of the ground plane 11 has a length of 28 mm
  • the third portion 41 of the ground plane 11 has a length of 36 mm
  • the gap 45 is 4 mm.
  • the vias 46 are nominally 0.75 mm (0.030") in diameter.
  • the pad 48 is 2.5 mm (0.100") in diameter and the center of the pad 48 is spaced 12 mm from the first end 30 of the substrate 27.
  • the opening 47 has about 6 mm clearance from the pad 48.
  • the second edge 23 of the tab 14 of the circuit element 10 is spaced 4 mm from the first end 30 of the substrate 27.
  • the antenna described is particularly suited for installation in normally unfriendly RF environments.
  • the antenna has been found to work well within an enclosure. Examples include wireless metering applications such as vending machines and meter boxes.
  • the antenna is also suitable as an internal antenna for portable telephone handsets.

Landscapes

  • Waveguide Aerials (AREA)

Abstract

L'invention porte sur une antenne plane compacte en F inversé utilisable pour des télémesures comprenant un circuit (10), un plan (11) de sol, et une sonde d'alimentation (49). Le circuit (10) comporte une partie plane présentant une fenètre (20) de réactance et une languette (14) étroite reliée au plan (11) de sol et s'étendant transversalement à la partie plane. La fenètre (20) de réactance et la languette (14) réduisent la tailledu circuit (10). La sonde d'alimentation (49) est montée entre le circuit (10) et le plan (11) de sol. Le plan (11) de sol comporte des parties conductrices entourant un substrat, de manière à réduire la taille du plan de sol. La longueur de la languette, et donc la distance entre la partie plane et le plan de sol, est choisie pour que la sonde d'alimentation soit un élément rayonnant. L'antenne, compacte et présentant de bonnes caractéristiques d'isotropie, est sensible à deux polarisations perpendiculaires.
PCT/US2000/040740 1999-08-27 2000-08-25 Antenne plane compacte en f inverse WO2001017064A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80344/00A AU8034400A (en) 1999-08-27 2000-08-25 Compact planar inverted f antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15127499P 1999-08-27 1999-08-27
US60/151,274 1999-08-27

Publications (1)

Publication Number Publication Date
WO2001017064A1 true WO2001017064A1 (fr) 2001-03-08

Family

ID=22538032

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/040740 WO2001017064A1 (fr) 1999-08-27 2000-08-25 Antenne plane compacte en f inverse

Country Status (3)

Country Link
US (1) US6218991B1 (fr)
AU (1) AU8034400A (fr)
WO (1) WO2001017064A1 (fr)

Cited By (8)

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US6458556B1 (en) * 1996-07-25 2002-10-01 The Institute Of Physical & Chemical Research Method for enhancing enzyme activity at elevated temperature
EP2355242A1 (fr) * 2010-02-02 2011-08-10 Laird Technologies AB Dispositif d'antenne pour dispositif de communication radio
EP2355241A1 (fr) * 2010-02-02 2011-08-10 Laird Technologies AB Dispositif d'antenne pour dispositif de communication radio
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8896493B2 (en) 1999-10-26 2014-11-25 Fractus, S.A. Interlaced multiband antenna arrays
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US9331382B2 (en) 2000-01-19 2016-05-03 Fractus, S.A. Space-filling miniature antennas
US9755314B2 (en) 2001-10-16 2017-09-05 Fractus S.A. Loaded antenna

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DE19822371B4 (de) * 1998-05-19 2018-03-08 Ipcom Gmbh & Co. Kg Antennenanordnung und Funkgerät
SE516474C2 (sv) * 1999-11-19 2002-01-22 Allgon Ab Antennanordning och kommunikationsanordning innefattande en sådan antennanordning
US6567047B2 (en) * 2000-05-25 2003-05-20 Tyco Electronics Logistics Ag Multi-band in-series antenna assembly
US6515630B2 (en) * 2000-06-09 2003-02-04 Tyco Electronics Logistics Ag Slot wedge antenna assembly
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US6366248B1 (en) * 2001-02-05 2002-04-02 Ian Soutar Portable radio antenna enhancement using non-contacting device
KR100387039B1 (ko) 2001-03-24 2003-06-12 삼성전자주식회사 도전성 튜브를 구비한 휴대용 단말기의 인입/인출 안테나장치
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KR101263267B1 (ko) * 2005-03-15 2013-05-10 갈트로닉스 코포레이션 리미티드 용량성 급전 안테나
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US6458556B1 (en) * 1996-07-25 2002-10-01 The Institute Of Physical & Chemical Research Method for enhancing enzyme activity at elevated temperature
US9240632B2 (en) 1999-09-20 2016-01-19 Fractus, S.A. Multilevel antennae
US10056682B2 (en) 1999-09-20 2018-08-21 Fractus, S.A. Multilevel antennae
US9362617B2 (en) 1999-09-20 2016-06-07 Fractus, S.A. Multilevel antennae
US9761934B2 (en) 1999-09-20 2017-09-12 Fractus, S.A. Multilevel antennae
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US8976069B2 (en) 1999-09-20 2015-03-10 Fractus, S.A. Multilevel antennae
US9000985B2 (en) 1999-09-20 2015-04-07 Fractus, S.A. Multilevel antennae
US9054421B2 (en) 1999-09-20 2015-06-09 Fractus, S.A. Multilevel antennae
US9905940B2 (en) 1999-10-26 2018-02-27 Fractus, S.A. Interlaced multiband antenna arrays
US8896493B2 (en) 1999-10-26 2014-11-25 Fractus, S.A. Interlaced multiband antenna arrays
US10355346B2 (en) 2000-01-19 2019-07-16 Fractus, S.A. Space-filling miniature antennas
US9331382B2 (en) 2000-01-19 2016-05-03 Fractus, S.A. Space-filling miniature antennas
US9755314B2 (en) 2001-10-16 2017-09-05 Fractus S.A. Loaded antenna
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11735810B2 (en) 2006-07-18 2023-08-22 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US10644380B2 (en) 2006-07-18 2020-05-05 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11031677B2 (en) 2006-07-18 2021-06-08 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11349200B2 (en) 2006-07-18 2022-05-31 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
EP2355242A1 (fr) * 2010-02-02 2011-08-10 Laird Technologies AB Dispositif d'antenne pour dispositif de communication radio
EP2355241A1 (fr) * 2010-02-02 2011-08-10 Laird Technologies AB Dispositif d'antenne pour dispositif de communication radio

Also Published As

Publication number Publication date
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US6218991B1 (en) 2001-04-17

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